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Science (English Medium) Class 11 - CBSE Question Bank Solutions

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Complete the following reaction:

\[\ce{C3H_{8(g)} + 3H2O_{(g)} ->[\Delta][catalyst]}\]?

[9] Hydrogen
Chapter: [9] Hydrogen
Concept: undefined >> undefined

Complete the following reaction:

\[\ce{Zn_{(s)} + NaOH_{(aq)} ->[heat]}\]?

[9] Hydrogen
Chapter: [9] Hydrogen
Concept: undefined >> undefined

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An aqueous solution of borax is _______.

[11] Some P-block Elements
Chapter: [11] Some P-block Elements
Concept: undefined >> undefined

Explain the Structure of Diborane.

[11] Some P-block Elements
Chapter: [11] Some P-block Elements
Concept: undefined >> undefined

What do you mean by ozone hole?

[14] Environmental Chemistry
Chapter: [14] Environmental Chemistry
Concept: undefined >> undefined

Write Lewis structure of the following compounds and show formal charge on atom.

\[\ce{HNO3}\]

[4] Chemical Bonding and Molecular Structure
Chapter: [4] Chemical Bonding and Molecular Structure
Concept: undefined >> undefined

Write Lewis structure of the following compounds and show formal charge on atom.

\[\ce{NO2}\]

[4] Chemical Bonding and Molecular Structure
Chapter: [4] Chemical Bonding and Molecular Structure
Concept: undefined >> undefined

Write Lewis structure of the following compounds and show formal charge on atom.

\[\ce{H2SO4}\]

[4] Chemical Bonding and Molecular Structure
Chapter: [4] Chemical Bonding and Molecular Structure
Concept: undefined >> undefined

Represent diagrammatically the bond moments and the resultant dipole moment in \[\ce{CO2, NF3}\] and \[\ce{CHCl3}\].

[4] Chemical Bonding and Molecular Structure
Chapter: [4] Chemical Bonding and Molecular Structure
Concept: undefined >> undefined

Which of the following reactions increases production of dihydrogen from synthesis gas?

[9] Hydrogen
Chapter: [9] Hydrogen
Concept: undefined >> undefined

Match Column I with Column II for the given properties/applications mentioned therein.

Column I Column II
(i) \[\ce{H}\] (a) Used in the name of perhydrol.
(ii) \[\ce{H2}\] (b) Can be reduced to dihydrogen by \[\ce{NaH}\].
(iii) \[\ce{H2O}\] (c) Can be used in hydroformylation of olefin.
(iv) \[\ce{H2O2}\] (d) Can be used in cutting and welding.
[9] Hydrogen
Chapter: [9] Hydrogen
Concept: undefined >> undefined

Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.

[9] Hydrogen
Chapter: [9] Hydrogen
Concept: undefined >> undefined

How can \[\ce{D2O}\] be prepared from water? Mention the physical properties in which \[\ce{D2O}\] differs from \[\ce{H2O}\]. Give at least three reactions of \[\ce{D2O}\] showing the exchange of hydrogen with deuterium.

[9] Hydrogen
Chapter: [9] Hydrogen
Concept: undefined >> undefined

Amphoteric hydroxides react with both alkalies and acids. Which of the following Group 2 metal hydroxides is soluble in sodium hydroxide?

[10] S-block Elements (Alkali and Alkaline Earth Metals)
Chapter: [10] S-block Elements (Alkali and Alkaline Earth Metals)
Concept: undefined >> undefined

The formula of soda ash is ______.

[10] S-block Elements (Alkali and Alkaline Earth Metals)
Chapter: [10] S-block Elements (Alkali and Alkaline Earth Metals)
Concept: undefined >> undefined

A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in whitewashing due to disinfectant nature. What is the chemical formula of A?

[10] S-block Elements (Alkali and Alkaline Earth Metals)
Chapter: [10] S-block Elements (Alkali and Alkaline Earth Metals)
Concept: undefined >> undefined

When Zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?

(i) H+ ions

(ii) Mg2+ ions

(iii) Ca2+ ions

(iv) \[\ce{SO^{2-}4}\] ions

[10] S-block Elements (Alkali and Alkaline Earth Metals)
Chapter: [10] S-block Elements (Alkali and Alkaline Earth Metals)
Concept: undefined >> undefined

Complete the following reactions.

\[\ce{O^{2-}2 + H2O ->}\]

[10] S-block Elements (Alkali and Alkaline Earth Metals)
Chapter: [10] S-block Elements (Alkali and Alkaline Earth Metals)
Concept: undefined >> undefined

Complete the following reactions.

\[\ce{O^{-}2 + H2O ->}\]

[10] S-block Elements (Alkali and Alkaline Earth Metals)
Chapter: [10] S-block Elements (Alkali and Alkaline Earth Metals)
Concept: undefined >> undefined

In the Solvay process, can we obtain sodium carbonate directly by treating the solution containing (NH4)2CO3 with sodium chloride? Explain.

[10] S-block Elements (Alkali and Alkaline Earth Metals)
Chapter: [10] S-block Elements (Alkali and Alkaline Earth Metals)
Concept: undefined >> undefined
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